I'm curious what the diffusers are made of. They appear to be wooden. If they are wooden, or really any solid material, they're only effective to a few hundred hertz judging by their apparent size. Also, the carpet in the room is going to treat the same frequency range as the diffusors and leave the bass alone. Finally, the diffusors at the reflection point are questionable to me because the sound will still reflect from there, most of it will not go toward the listener though. All in all, the room has the potential to sound boomy.
I do like the fact that it's at least being mentioned, though.
It looks to me that there are absorbers (smooth tan panels) at the specific left & right speaker reflection points and diffusors between and everywhere else. The diffusors appear to be designed to operate in the 500hz to 7kHz range, which is the most critical range for any such device. Sure, we'd all love a diffusor operating down to 100Hz, but that would HUGE!